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Computer Science - Electronic Principles

Exercise : Electronic Principles - Section 1
16.
Which one of the following statements best describes magnetic hysteresis?
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
Hysteresis is most apparent when the core material is saturated
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
Which one of the following phrases best describes residual magnetism?
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The force of attraction between the poles of a permanent and temporary magnetic field
The amount of magnetic flux that is not confined to the core material of an electromagnet
The circular magnetic field that surrounds a conductor carrying a current
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
7.8 mA
208 mA
200 mA
300 mA
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
P = I2R
P = IE
P = E2/R
I = P/E
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Which one of the following phrases most accurately describes a purely inductive circuit?
Resistances provide the only opposition to current flow
Inductive reactance provides the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow
The ac voltage lags the current by 90 degree
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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